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Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…
... (mistery?) behind ULA's spectrum screen memory interpretation?
... to draw something on screen you have to poke ... behind this implementation? Why screen memory isn't interpreted continuously? ... draw something on screen avoiding 3 block structure? -
Memory usageBrowsing the online documentation for the Spectrum I came across a peculiar discrepency. As we all know the start of the RAM is at 16384 which is whe…
... which is where the screen memory resides. The screen memory ends at 23296. After ... is what on earth the memory before KSTATE and after the ... video memory is used for on a ... -
Does Screen Flipping work on a 48k Spectrum?On the other post it showed some basic code to flip the screen on a +3. Does it work on a 48k Spectrum. Can anyone show me the machine code to: Se…
... basic code to flip the screen on a +3.
Set the screen memory to default 16384
Write ... backbuffer 49152
Flip the screen memory to 49152
Many ... -
Watching screen while debugging???I'll try to state my problem clearly, but I don't know if I'll succeed ..:) I load a Spectrum program into emulator (it doesn't matter which one at …
... single instructions writing data to screen memory. It works this way: ... suddenly,after many instructions,all screen is refreshed.
screen memory [U]at the moment ... emulator, to watch changes to screen immediately?
... -
Erase part of memory in SPIN?A question for SPIN (or perhaps Spectaculator). If I have a game loaded in memory and would like to erase part of the memory while keeping the rest …
... have a game loaded in memory and would like to erase ... part of the memory while keeping the rest of ... would like to erase the screen memory and watch what will happen ... -
Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... were copying graphics directly to screen memory starting at 16384. Now I ... 'm experimenting with screen buffer where I could draw ... I would copy it to screen memory.
You may see ... static image from buffer to screen after HALT.
Am ... -
Strange DivIDE ScreenI've just got an SD card adaptor for my DivIDE and it does something strange. On startup, I can see the DivIDE logo and it registers the adaptor, bu…
... normally empty areas of the screen are covered in an odd ... from the bytes in the screen memory. I can load a .TAP ... bit of corruption to the screen.
I actually got ... -
Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... x coordinate and the screen memory address I'm ... 256 = 16384 = start of screen display.
ld d,a ... ; squares 0 - 31 across screen.
add a,e ... e,a ; de = address of screen.
ret
Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…
... :
When clearing the screen buffer, it was actually much ... to the end of the screen memory area and push zero values ... onto the stack until the screen area was filled.
memory. I think this worked because ...Where does the BASIC program sit 48K Spectrum memory?Hi there First post so be gentle, I've had a spectrum since the 80's and have recently started programming it for fun again. I wrote the followin…
... POKE command directly to the screen memory.
5 LET a ... part of memory first then dump it to the screen quickly? Where ...ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
... offset that covers the Spectrum Screen Memory (6912bytes so only 13bits ... progression follow the spectrum screen memory layout in a way ... etc...). It scans the screen memory by character square so -& ... ; 7t - move into screen memory (basically add 16384 to the ...is there a way of reading characters off the screen and turning that into a string? this has to be done in basic. i know it would have something to do with peeking memory (maybe screen memory) but would this change due to programs r…
... something to do with peeking memory (maybe screen memory) but would this change ... due to programs running in the memory ... ? i also need it to carry on reading the screen ...Idea about improving EmulatorHi, I got a bright idea today how to improve such excellent emulators a bit more. Okay, disassemblers are available in nearly every one new released …
... sprites, chunks, painting on second screen, memory copy and bit-test, or ... fact, a PC has enough memory and power to optimize the ... code for speed or memory usage, so the compiled code ...My first attempt at Gigascreen interlacingWonderful. Did some research on the port which controls memory paging and wrote a short BASIC programme to switch pages 5 and 7 in and out of the scr…
... on the port which controls memory paging and wrote a short ... in and out of the screen memory. I tried to load a ...Recording AVI`s of Speccy stuff Does anyone know of a good program for XP that will record AVI or Mpeg movies from the output of Spectrum emulators? I know at least one emulator h…
... which different progs write to screen memory..
Anyhow.. I`d ...ZX80 - it wont die.The Mighty Dope Throne's ZX80 cgc entry has got me thinking. Does anyone know anything about how the zx80 works internally? is it very close to the z…
... what values are in the memory. Can anyone explain how this ... enough trouble grasping the speccies screen memory, but im interested.
Also ...unreleased spectrum protection system - any use any more? also pokerama sourceDon't know if anyone's interested in this. During my days hacking games for Your Sinclair and Crash (and Sinclair User for a while) I had a pet proje…
... over the ROM and the screen and ended up changing itself ... decrypters but running in the screen memory, a turboload which changed speed ...XLR-8 Mastering utils: quick heads-upFirstly, only do this using an emulated 48K rubberkey at this stage because that's all it was ever tested on. "LOADER MAKER" - "First decrypter" - p…
... the bottom 2/3 screen memory. It's the address ... the basic into the screen area which is where ... launches it)
"SCREEN$ DESIGNER" - firstly, load the ... loading screen. After a short pause ... It'll stick the screen into SoftRom and bomb ...128k Page FlippingOver on adverts, AOwen wrote the following: [quote=aowen]The trick, as I understand it, is to redraw the whole screen each time at #c000, but point…
... looking at screen 0:
page screen 1 into ... screen 1
page screen 0 into #c000
draw screen ... of the screen, (a normal speccy screen takes up ... br /> Point ULA at screen page 1
Point ... br /> 1. Only the screen memory, not the whole 16k is ...Aggravating problem with screensI've rewritten my Sam C runtime emulator code ( well almost ) to allow me to use my own routines for blitting sprites onto the screen, storing tiles …
... the top of the screen memory and the end of ... pages into memory to write to a screen. So I ... location of a "screen" address in memory, or if Sam ... ? Because Sam-C nicks active memory:
[QUOTE]
memory above the screen memory ( yes, I ...New Scumball 2 game!This game was posted in another thread some time ago now but after the ongoing Cybernoid discussion I thought I'd just overhaul the graphics a little…
... complete crap game running in screen memory :)Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... all the counter states into memory locations and fetch them ... screen
ld a,(de) ;get byte from graphic store in memory ...
ld (hl),a ;put graphic into screen
ld (hl),a ;write to screen memory
dec hl ;move back ...Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…
... altering flags - maybe set a screen memory bit so if you get ... a full screen it's okay but missing ...VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…
... , where addr is in the screen memory area.)
There is ...BASin r14c - maintenance releaseAfter the recent discussions, BASin has been released as version 14c. It's only a maintenance release, and some of the really big new features are un…
... current mouse position in screen memory to the paintbox's ... Added - "Pixellise" tool to SCREEN$ Editor. This will eventually form ... been moved partially off the "screen". (Badbeard)
Fixed - ... - Toolbar buttons in the SCREEN$ editor should no longer disappear ...What is exactly the scr format?Hello everyone and I hope you are having a wonderful Christmas. I'm trying to understand the use of the scr format. I understand it's a screen memor…
... . I understand it's a screen memory dump in raw format. But ...DRAM without powerSomething interesting I noticed last night, after making a bad Spectranet ROM image which crashed the machine... Looking at the image on the screen,…
... at the image on the screen, even after the machine was ... seconds, the text on the screen was still readable even with ... recognisable image can remain in screen memory with the power removed.Jumping to BASIC after importing 23296,1703Sorry for the confusing title. :-D Now that I've learned how to stop a game from starting after loading (in Fuse and Specemu), I have a few more que…
... probably import it to the screen memory or even store it on ... have mastered m.c. a screen resident monitor is probably a ...How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…
... fourth?) Z80 shared our contended memory, then we could "easily" ... onto CPU1 to copy the screen memory, and voila, we have ... write multiple values in adjacent memory locations, by having CPU1 ... we replace the existing memory with faster memory, would we then ..."Wingman" demoHi, Just a quick post to inform you of a demo of my new game "Wingman" currently under development: [URL]http://www.ipear.co.uk/peargames/wing01.…
... only as I use the Screen/Memory Page technique.
[IMG ...
